Latest Airport Extreme and a Linksys modem router

i've bought extreme, because wanted facility set guest network. in naivety thought had plug in extreme linksys, turn off linksys wireless, , away go.
seems i've read extreme set in bridge mode , therefore not possible create guest account.
know if can disable 'router' function in linksys , use modem, can set extreme nat , dhcp mode?
thanks,
rob

 

it if posted linksys model number can you...

 

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